FM 100-15 (OBSOLETE) A Manual For Commanders Of Large Units (provisional), Volume 1, Operations
1930-04-10 "This provisional manual deals with the employment of large units in both open and stabilized warfare. It is assumed that the enemy is equal in intelligence to ourselves and that he is as well armed, trained, and supplied. This manual is intended as a guide for commanders and staffs of divisions, corps, armies, and groups of armies, and for general headquarters. It contemplates the employment of forces varying in strength from a single division to the maximum mobilized man power of the Nation. Throughout the manual, the term "large unit" is applied to the division, corps, army, and group of armies."
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